kvm: Add a new machine property kvm-type

Targets like ppc64 support different typed of KVM, one which use
hypervisor mode and the other which doesn't. Add a new machine
property kvm-type that helps in selecting the respective ones
We also add a new QEMUMachine callback get_vm_type that helps
in mapping the string representation of kvm type specified.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>